needmoregarage

groundhog

Won't be, they are specials from performance friction - you have to get them through Manthey - if they will sell and ship

18s on a GT4 with 050 soft would be excellent

groundhog

There are a lot of assumptions around the 4l, its the head design and internals (cams, rods, crank, pistons) that count - the short block is inconsequential other than in terms of liners, oil flow and cylinder wall thickness (if there is a material difference). From a performance perspective I quite like what Porsche have done with the 9A1, simple, effective and reliable particularly if mated with PDK. Hits a lot of buttons for a track car. Then again there are an awful lot of used 991 GT3s on the market (at least where I live).

I could see Porsche using the 4l block and more mainstream internals to deliver between 425 (with more under the curve up top) and 450HP - I certainly wouldn't be surprised if peak HP remained at 425 - the small increase in torque across the rev range would be beneficial, nice but not other worldly if the top end is artificially capped where the really good gains could be achieved. (However that is dependant on the compression ratio too e.g 12.5? 12.9? and an unlikely 13.3).

They may do something more special for a RS version but other than that watch out for marketing around the 4L moniker if indeed it does eventuate e.g. look at the gear ratios and torque curve, ignore the marketing

Whoopsy

Actually they are not that special, and are standard Cup car parts. Race car parts can be had via PMNA, if ones knows the part numbers to order them.

But truth is, they are race parts, for street use they won't be satisfactory.

Come to think of it, those are from the Cup car, so the mounting are for Cup car suspension, not normal GT4 suspension.

groundhog

Specials as in non-Brembo and indeed they look like the nickel coated callipers found on Cup cars. The other issue around swapping out for PFC includes the brake master cylinder and slave plus PTV and ABS calibration (if attempting a swap to a road going GT4).

I can see where gazza is coming from - I suspect he needs a car that can be road registered at the point of purchase and gets frustrated at the lack of options of wheels and tires (due to clearance issues with Brembos). I have found this a big issue in road rallying (for example) particularly given supp regs specify the actual number of tires - in fact your supply is marked up during scruit. In most cases this means you are reliant on Cup 2s or Trof Rs which are much slower than 050 (soft).

Do you know if the gear ratios and final reduction ratio have remained the same or have changed?

ToasterThief

enzotcat

Dumb question - what's the difference between the "GT4 MR" and the "GT4 Clubsport" - is that denoting "Manthey Racing" as in the equivalent of an "AMG" or "M" moniker?

LordLucan

greggmorton

GoKart Mozart

Agreed, but won't Porsche be hampered by emission regulations? Although I have no clue as of which of their engines meets the CO standard, or whatever criteria allows them more leniancy?

spyderphile

Is there a reason rotors aren't cross-drilled as in road models? I suspect cross-drilling helps with channeling away the water in wet conditions. Probably there are heat dissipation benefits too. Wouldn't race model gain from such benefits?

venom51

Cross drilled tend to crack around the holes after being beat on for a bit.

TRAKCAR

Warwick Morris

I think you will find that Manthey is owned 50% by Porsche and 50% by Olaf. So strong factory connections but independent. like a way to have a skunkworks.

997rs4.0